My glowstone looks strange in Minecraft (Media Included)?

Hi. I'm building a modern house by following a tutorial on YouTube and the guy's glowstone looks pretty different to mine. The picture of the glowstone included in this question is mine and the one in the link below is his. The glowstone looks the same but the shade it gives on my quartz is very different to his. The shades his glowstone give kind of blend in together and that gives him a LOT more lighting.
Any help would be much appreciated. Thanks

Link:

My glowstone looks strange in Minecraft Media Included

Set smooth lighting to maximum and put the slider to 100%. This can be found in the video settings.